The application principle and cover problem of energy-saving technology for variable frequency speed regulation of circular arc gear pump

[1] The application principle of frequency conversion speed regulation energy-saving technology for gear pumps

With the continuous progress of technology, frequency conversion speed regulation energy-saving technology has been widely applied in the operation process of petrochemical circular arc gear oil pumps and has achieved good application results.

. It can be said that frequency conversion speed regulation technology has become a measure for the current petrochemical industry to achieve energy-saving production

The key to the application of variable frequency speed regulation energy-saving technology lies in the use of variable frequency equipment to adjust the frequency of the motor stator power supply, achieve adjustment of the rotational speed, and promote significant changes in the ratio between voltage and frequency. At the same time, the energy-saving method of variable frequency speed regulation is mostly based on valve adjustment angle. By applying variable frequency speed regulation equipment, all valves are opened, and the motor operating speed is changed by changing the frequency of the motor power supply

In terms of control mode selection, frequency conversion speed regulation energy-saving technology mainly adopts single circuit control and double circuit control. Among them, the single loop control method is mainly controlled by variable frequency speed regulation, which controls the signal output of the control system to strengthen the control of the conveying process of the variable frequency equipment and achieve the goal of reasonable control of pump flow. The dual loop control method mainly takes the main control circuit as the control object, and has a regulating control effect on the gear pump diversion process

[2] Problems with the mechanical sealing surface of gear oil pumps

There are many ways for the mechanical sealing surface to be damaged, such as natural wear of the dynamic and static rings due to long-term operation; If the material used for mechanical seal friction pairs is unreasonable, it will cause accelerated wear of the mechanical seal friction pairs, leading to premature failure; The installation of mechanical seal end faces may have issues such as scratches and bumps; There are impurities between the dynamic and static rings; During the operation of the sealing end face, materials such as graphite that are prone to breakage may experience significant vibrations due to the presence of solid particles on the contact surface, resulting in damage issues. Therefore, when selecting the form of mechanical seal, it is necessary to consider various factors such as the working medium, operating temperature, and pressure inside the gear oil pump, in order to determine a scientifically reasonable mechanical seal method

Mechanical seals have very strict requirements for design. When the mechanical seal meets the requirements of working conditions and the equipment needs to be restarted after running for a long time, the end face of the mechanical seal may have impurities particles or crystalline impurities attached, which can cause leakage problems in the mechanical seal. In this case, only cleaning is required to meet the requirements, and there is no need to replace the mechanical seal device with a new one. In addition, some mechanical seals have uneven end faces, which can be reasonably ground and polished based on specific wear conditions. They can also be directly applied without leakage, avoiding excessive maintenance costs